User guide

50,000 hours, so tube failure is highly unlikely. However, if the microphone should develop a
vacuum tube related problem, it must be returned to the factory for service.
Voltage Conversion
The R-122V is energized from a dedicated power supply that operates from an AC voltage
source. The supply can be configured to operate with the following voltages:
100-120 Volts 50-60HZ
220-240 Volts 50-60HZ
Fuse Replacement
The AC line fuse is located within the IEC power connector. Your power supply was shipped
with a fuse rating suitable for the country in which it was sold. Should the fuse require
replacement, two types are used.
200-ma, Slow-Blow type for 100-120 volt operation
100-ma, Slow-Blow type for 220-240 volt operation
If when replacing a blown fuse the new fuse blows, your power supply must be serviced. Never
substitute a larger size fuse in an attempt to make a faulty power supply work! This invalidates
the R-122V’s lifetime warranty and could precipitate a fire, shock or other health hazard.
R-122V CABLE PINOUT
7-Pin XLR Function Specifics:
Pin 1 Ground
Pin 2 Signal Hot (+) (unbalanced)
Pin 3 No Connection (open)
Pin 4 High DC Plate Supply (approximately
Voltage 135-VDC)
Pin 5 Heater supply (6-Volts DC)
Pin 6 Ground
Pin 7 No Connection (open)
(See page 8 for complete instructions on changing fuses and voltage)
Caution!
Keep recorded tapes, spring-wound watches, and personal credit cards using magnetic coding
away from the microphone to prevent possible damage to them caused by the transducer’s
powerful magnets.
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